The HARPS search for southern extra-solar planets

We report on the detection of two new multiple planet systems orbiting solar-like stars HD 47 186 and HD 181 433. The first system contains a hot Neptune of 22.78 with a 4.08-day period and a Saturn of 0.35 MJUP with a 3.7-year period. The second system contains a Super-Earth of 7.5 with a 9.4-day period, a 0.64 MJUP with a 2.6-year period, and a third companion of 0.54 MJUP with a period of about 6 years. These detections increase to 20 the number of close-in low-mass exoplanets (below 0.1 MJUP) and strengthen the fact that 80% of these planets are in multiple planetary systems.